Guinea-Bissau is about 3.2 times smaller than Pennsylvania.

Pennsylvania is approximately 116,075 sq km, while Guinea-Bissau is approximately 36,125 sq km, making Guinea-Bissau 31.12% the size of Pennsylvania. Meanwhile, the population of Pennsylvania is ~12.7 million people (10.7 million fewer people live in Guinea-Bissau).
Tip: This to-scale comparison of Pennsylvania vs. Guinea-Bissau uses the Mercator projection, which distorts the size of regions near the poles.